Abstract
The Reconcavo Basin is part of a rift formed between the Late Jurassic and the Early Cretaceous in northeastern Brazil. The objective of this thesis was the compositional modeling of petroleum generation, expulsion and migration along a cross-section in the Southern Compartment of the basin with the Temispack basin simulation software. A geochemical study of the lacustrine shales of the Gomo Member (Candelas Fm.) has been performed to determine their petroleum potential, the evolution of maturation with depth and changes in petroleum composition. Hydrogen indices of immature kerogens (400-850 mg/g TOC) were shown to be higher than those of whole rocks, thus indicating a retention of Rock-Eval pyrolysis products in the mineral matrix of these type I source rocks. Saturates (30-50% of organic extracts in the immature zone) increase both in absolute and in relative (60-80%) terms in the oil window (2000-2600 m) because of a partial secondary cracking of NSOs and aromatics. After having tested several scenarios of geodynamic evolution between the Aptian and the Oligocene, a variable thickness of post-rift sediments (maximum of 1200 m) has been shown to be necessary to calibrate maturity parameters. Petroleum migration has been modeled to understand migration pathways as well as the
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Citation Formats
Barroz Penteado, H.L. de.
2D compositional modeling of petroleum generation, expulsion and migration in the Southern compartment of the Reconcavo Basin, Brazil; Modelisation compositionnelle 2D de la genese, expulsion et migration du petrole dans le compartiment sud du Bassin de Reconcavo, Bresil.
France: N. p.,
1999.
Web.
Barroz Penteado, H.L. de.
2D compositional modeling of petroleum generation, expulsion and migration in the Southern compartment of the Reconcavo Basin, Brazil; Modelisation compositionnelle 2D de la genese, expulsion et migration du petrole dans le compartiment sud du Bassin de Reconcavo, Bresil.
France.
Barroz Penteado, H.L. de.
1999.
"2D compositional modeling of petroleum generation, expulsion and migration in the Southern compartment of the Reconcavo Basin, Brazil; Modelisation compositionnelle 2D de la genese, expulsion et migration du petrole dans le compartiment sud du Bassin de Reconcavo, Bresil."
France.
@misc{etde_20017949,
title = {2D compositional modeling of petroleum generation, expulsion and migration in the Southern compartment of the Reconcavo Basin, Brazil; Modelisation compositionnelle 2D de la genese, expulsion et migration du petrole dans le compartiment sud du Bassin de Reconcavo, Bresil}
author = {Barroz Penteado, H.L. de}
abstractNote = {The Reconcavo Basin is part of a rift formed between the Late Jurassic and the Early Cretaceous in northeastern Brazil. The objective of this thesis was the compositional modeling of petroleum generation, expulsion and migration along a cross-section in the Southern Compartment of the basin with the Temispack basin simulation software. A geochemical study of the lacustrine shales of the Gomo Member (Candelas Fm.) has been performed to determine their petroleum potential, the evolution of maturation with depth and changes in petroleum composition. Hydrogen indices of immature kerogens (400-850 mg/g TOC) were shown to be higher than those of whole rocks, thus indicating a retention of Rock-Eval pyrolysis products in the mineral matrix of these type I source rocks. Saturates (30-50% of organic extracts in the immature zone) increase both in absolute and in relative (60-80%) terms in the oil window (2000-2600 m) because of a partial secondary cracking of NSOs and aromatics. After having tested several scenarios of geodynamic evolution between the Aptian and the Oligocene, a variable thickness of post-rift sediments (maximum of 1200 m) has been shown to be necessary to calibrate maturity parameters. Petroleum migration has been modeled to understand migration pathways as well as the role of faults as drains. Thus, two petroleum migration systems have been identified for the Dom Joao and Cexis accumulations. Petroleum compositional variations have been modeled by coupling the processes of retention and secondary cracking. A good calibration of compositions was obtained with secondary cracking parameters for NSOs and aromatics which are close to those of the main primary cracking reaction of a type I kerogen, coupled with a retention of 50% of NSOs within the source rocks. (author)}
place = {France}
year = {1999}
month = {Jan}
}
title = {2D compositional modeling of petroleum generation, expulsion and migration in the Southern compartment of the Reconcavo Basin, Brazil; Modelisation compositionnelle 2D de la genese, expulsion et migration du petrole dans le compartiment sud du Bassin de Reconcavo, Bresil}
author = {Barroz Penteado, H.L. de}
abstractNote = {The Reconcavo Basin is part of a rift formed between the Late Jurassic and the Early Cretaceous in northeastern Brazil. The objective of this thesis was the compositional modeling of petroleum generation, expulsion and migration along a cross-section in the Southern Compartment of the basin with the Temispack basin simulation software. A geochemical study of the lacustrine shales of the Gomo Member (Candelas Fm.) has been performed to determine their petroleum potential, the evolution of maturation with depth and changes in petroleum composition. Hydrogen indices of immature kerogens (400-850 mg/g TOC) were shown to be higher than those of whole rocks, thus indicating a retention of Rock-Eval pyrolysis products in the mineral matrix of these type I source rocks. Saturates (30-50% of organic extracts in the immature zone) increase both in absolute and in relative (60-80%) terms in the oil window (2000-2600 m) because of a partial secondary cracking of NSOs and aromatics. After having tested several scenarios of geodynamic evolution between the Aptian and the Oligocene, a variable thickness of post-rift sediments (maximum of 1200 m) has been shown to be necessary to calibrate maturity parameters. Petroleum migration has been modeled to understand migration pathways as well as the role of faults as drains. Thus, two petroleum migration systems have been identified for the Dom Joao and Cexis accumulations. Petroleum compositional variations have been modeled by coupling the processes of retention and secondary cracking. A good calibration of compositions was obtained with secondary cracking parameters for NSOs and aromatics which are close to those of the main primary cracking reaction of a type I kerogen, coupled with a retention of 50% of NSOs within the source rocks. (author)}
place = {France}
year = {1999}
month = {Jan}
}